To a medium pot over medium heat, add oil, then butter and onion. Saute onion bits 2 minutes, then add frozen peas, raise heat a bit. Stir peas to heat them through and allow their water to evaporate. When peas are heated through, add ricotta and parsley to the pan and smash cheese together with the peas. Add lemon zest. Season mixture with salt and pepper and serve.
Recipe courtesy of Rachael Ray